Cage 9r636 is the oem
A structural shape fabricated from a ferrous or nonferrous material and has a flange extending usually at right angles in the same direction from each edge of a web and/or resembling the letter u in cross-sectional form.
NSN 5895-01-047-7320
NSN 5975-00-226-1167
NSN 5945-01-634-0588
NSN 6320-00-908-6841
NSN 5998-01-441-2658
NSN 4140-01-017-8292
NSN 5996-01-513-9656
NSN 5910-01-284-4593
NSN 6105-01-235-0860
NSN 6135-01-333-6101
NSN 6145-01-605-9983
NSN 5895-00-993-1583